122results about How to "Reduce Data Transfer Latency" patented technology

A control apparatus provides a transfer instruction to one of storage apparatus and a cache apparatus, in which relevant data is stored, when receiving an access request from a client apparatus for the data for which the storage location is managed; and the one of the storage apparatus and the cache apparatus receiving the transfer instruction directly returns a reply message, to the client apparatus, having information of the storage location of the data added thereto, which data the access request requests.

A method and apparatus for generating checksum values for data segments retrieved from a data storage device for transfer into a buffer memory, is provided. A checksum list is maintained to contain checksum values, wherein the checksum list includes a plurality of entries corresponding to the data segments stored in the buffer memory, each entry for storing a checksum value for a corresponding data segment stored in the buffer memory. For each data segment retrieved from the storage device: a checksum value is calculated for that data segment using a checksum circuit; an entry in the checksum list corresponding to that data segment is selected; the checksum value is stored in the selected entry in the checksum list; and that data segment is stored in the buffer memory. Preferably, the checksum circuit calculates the checksum for each data segment as that data segment is transferred into the buffer memory.

A radio communication system of an HARQ method that makes an HARQ transmission interval of subpackets appropriate and reduces data transmission delay resulting from subpacket retransmission. In the radio communication system in which a packet is transmitted and receives with the HARQ method between a base station and multiple radio mobile stations, each of the base station and the multiple radio mobile stations has: a packet transmission circuit for transmitting subpackets in predetermined intervals; a packet reception circuit for repeating decoding processing by combining a newly received subpacket and a previously received former subpacket until an original packet is successfully decoded; and a HARQ control equipped with a function of, for packet communication whose data length is short, transmitting a subpacket or response from the packet transmission circuit in an HARQ transmission interval that is shortened from the HARQ transmission interval of the normal mode.

A method for a time division duplex mobile communication system comprises that setting a minimum unit of transmission time interval and a system frame structure, wherein each radio sub frame is composed of a downlink pilot time slot, a switching guard period, a synchronization time slot and a plurality of service time slots, and the transmission time interval uses the length of time slot as a unit; a user obtaining downlink synchronization by receiving downlink pilot information of the downlink pilot time slot, and obtaining corresponding configuration information of cell by reading cell broadcasting information, and then transmitting uplink synchronization information in the synchronization time slot to fulfill a random access process, wherein the configuration information includes transmission time interval and system frame structure information; the network side/the user transmitting call information to an opposite end, and the opposite end processing call acknowledgement according to the transmission time interval; the network side allocating a channel for the user, wherein the network side and the user communicates through the allocated channel. The method reduces data transmission delay during communication, improves call throughout.

The present invention provides two primary Hybrid Automatic Repeat reQuest (HARQ) mechanisms for a multi-hop network, i.e. an active Mobile Multi-hop Relaying (MMR) HARQ and a passive Mobile Multi-hop Relaying (MMR) HARQ. According to the solution of the present invention, there are provided a method and a device for HARQ retransmission in relay stations of a wireless communication network, wherein in HARQ retransmission, the HARQ procedure is implemented based on resource allocated by a base station; and a method and device for HARQ in a base station, characterized in that a HARQ procedure is implemented in-between one or more relay stations and a mobile station. With the methods of the present invention, the HARQ problems existing in a multi-hop network are overcome, the correction rate of data transmission is improved, while time delay for data transmission is reduced.

A data storage device includes a memory die including a plurality of storage elements arranged in a three dimensional (3D) memory configuration and a controller die coupled to the memory die via a bus including a plurality of electrical contacts between adjacent surfaces of the memory die and the controller die. A method performed at the data storage device includes receiving, at the controller die, data to be stored at the memory die and generating a codeword representing the data. The codeword includes a particular number of bits. The method also includes sending signals from the controller die to the memory die via the plurality of electrical contacts. The plurality of electrical contacts includes at least as many electrical contacts as the particular number of bits of the codeword, and the signals representing the codeword are sent from the controller die to the memory die in parallel.

The invention discloses a method and a system for shortening time delay in a peer-to-peer network streaming media live broadcast system. The system is provided with a media source node and a cache routing server, wherein the media source node is used for the media resource management of the whole system; the cache routing server is used for media resource management, routing calculation and peer client end management in a local domain; the cache routing server is used for selecting a proper peer client end from other managed peer client ends and establishing streaming media data interaction with a request peer client end; when needed media streaming data does not exist in the peer client end managed by the cache routing server, the cache routing server is used for requesting needed streaming media data information from other cache routing servers and transmitting the needed streaming media data information to the request peer client end; and when the cache routing server is failed forobtaining the needed streaming media data from other cache routing servers, the cache routing server is used for obtaining the needed data from the media source node and transmitting the needed data to the request peer client end.

Provided are a method and apparatus for controlling media access in a sensor network and a method of managing traffic information. Since traffic information is exchanged between nodes and data is transmitted by using a dynamic long preamble according to receiver nodes, data transmission efficiency can be improved, energy consumed to transmit the long preamble can be reduced, and data transmission delay can be reduced as well.

The invention discloses a wireless Mesh network routing based on multi-path concurrence and a method thereof. With the adoption of the wireless Mesh network routing based on the multi-path concurrence and the method thereof, through calculating route delay-constrained parameters, identifying a networking topology, establishing an equivalent path time delay model and modifying a routing process, multiple transmission paths are used when nodes are transmitted, and even if data are lost on a single path, the transmission is not influenced, so that the reliability of the transmission is improved, the transmitted data are protected through multiple paths, retransmission of the data is reduced, the negative effect that a wireless link is unstable is lowered, the instantaneity is improved, more bandwidth can be acquired by adopting multi-path transmission, the end-to-end data transmission delay can be effectively reduced, and the fairness of network resource distribution can be improved.

The invention discloses a car-to-car data routing method which is characterized by comprising the following steps: a source node S broadcasts routing request packets (RREQ packets); after a destination node D or an intermediate node I receives the RREQ packets, the destination node D or the intermediate node I returns routing response packets (RREP packets) and records the maximum retransmission times MaxRetran of a path D to S and the maximum travel speed MaxSpeed; after S receives the RREP packets, S transmits the retransmission times packets (RRETRAN packets), records MaxRetran and MaxSpeed of a path S to D, and returns MaxRetran of the path D to S to D; after D receives the RRETRAN packets, D transmits the RRETRAN packets with marks and returns the MaxRetran of the path S to D to S; and after S receives the RRETRAN packets, S selects comprehensively according to the hop counts of the discovered paths, MaxRetran and MaxSpeed and selects the path with the minimum comprehensive criterion value as a forwarding path, thereby balancing the indices of hop counts, wireless link quality, car speed and the like. The method for acquiring the car speed information by the OBD technology has good practicality, accuracy and universality.

A method and system for statistically multiplexing corresponding channels using an orthogonal code hopping in a wire/wireless communication system, including a first communication station and multiple second communication stations, in which multiple synchronized communication channels coexist through one media. The system includes an orthogonal code hopping pattern generator, a spreader for selecting a corresponding orthogonal code symbol in the orthogonal code, a collision comparator and controller for monitoring whether the orthogonal code symbols collide and for determining whether the send data symbols to the second communication stations coincide in the collision area, a unit for stopping transmission in case of collision of the hopping patterns and discordance of the transmission data symbols, and a transmission power controller for compensating an average receiving energy loss.

The invention provides a 6LoWPAN-based nested mobile network routing optimization method. A 6LoWPAN network consists of more than one personal area network which comprises an access node and more than one mobile network comprising one mobile router and more than one mobile network node, wherein the access node and the mobile router are formed in a tree structure; and the mobile router realizes routing through the tree structure automatically. In the invention, the mobile network node can communicate with a communication node without the home proxy of the mobile router of the mobile network and without establishing a channel, the mobile network node can judge if a target communication node is in the same 6LoWPAN network as the mobile network node accurately according to the IPv6 address of the communication node, and thus, an optimal routing path to the target communication node is established and data transmission delay is shortened.

The invention belongs to the technical field of marine structure dynamic experiments, and relates to a reflection-free wave flume wave maker. The reflection-free wave flume wave maker comprises a control module, a transmission module, a data acquisition module and an absorption module, and is characterized in that the control module is responsible for general logic control for the system through a man-machine interface, the transmission module receives control instructions of the control module and performs corresponding control operations, the data acquisition module acquires the wave height in front of wave pushing plates of the wave maker in real time and feeds back the wave height to the absorption module, and the absorption module compares the feedback wave height with target wave height and converts the wave height into a wave making data sequence after being corrected by an absorption algorithm. The wave maker system can flexibly select a wave making mode, and normal wave making or reflection-free wave making is performed; and secondly, the wave maker can be configured flexibly, one-way wave making or two-way wave making is performed, and the wave making flexibility is improved. The reflection-free wave flume wave maker effectively improves the absorption wave making efficiency and can be widely applied to hydrodynamic physical model tests.

The invention provides a transmission method based on a quasi-random back-off strategy in a wireless distributed network. The transmission method comprises the following steps: counting the number Ai of data packets successfully transmitted by other sites except a transmission site i; counting an interval Si between the last busy end time slot of a channel to the transmission site arrival time slot of new data packets; determining first waiting time based on a time slot threshold value N on which certain back-off is turned into random back-off and a maximum back-off window length M in a quasi-random back-off process according to Ai and Si when the channel is judged to be idle for the first time, and transmitting the new data packets when the channel is judged to be idle for the second time; when a second judgment result indicates that the channel is busy, waiting till the channel is idle; if the channel is busy, waiting till the channel is idle; updating Ai; determining second waiting time according to Ai, N and M; judging whether or not the channel is idle for the third time, and returning to wait till the channel is idle if a third judgment result indicates that the channel is busy; and if the third judgment result indicates that the channel is idle, transmitting the new data packets.

The invention relates to a mining belt longitudinal tearing detection device and method based on a mining linear laser emitter and a mining visual sensor platform, and the method comprises the steps:obtaining a laser light bar image irradiated by linear laser on a belt as an interested area; Creating an image processing object on the mining vision sensor platform and copying image data of the interested area; carrying out enhancement and denoising on the image of the region of interest; obtaining a light bar segmentation threshold; obtaining a light bar image through threshold segmentation; obtaining a linear light center light bar; judging the characteristics of the linear light center light bar, and judging whether the belt is longitudinally torn or not. The invention discloses a miningbelt longitudinal tearing detection device and a detection method. Integrated processing of video collection, image algorithm analysis and control signal output is achieved on an embedded platform, the hardware structure is simplified, the algorithm is optimized, the algorithm complexity is reduced on the basis that the algorithm accuracy is not reduced basically, and online real-time detection of belt longitudinal tearing and control signal output are achieved.

A method and apparatus for reducing interference between systems when a plurality of wireless access systems are co-located are disclosed. To support CLC mode, an MS in the CRC mode transmits a handover request message to a first Base Station (BS) to initiate a handover process, receives a handover command message acknowledging the handover request message from the first BS, transmits a ranging request message to second BS at network reentry after handover, and receives from the second BS a ranging response message including CRC start time information that set by the second BS.

The invention relates to a fictitious force-based wireless sensor network aggregation node re-positioning method and belongs to the technical field of energy conservation for prolonging the life cycleof a wireless sensor network. The method comprises the following steps of firstly, obtaining the information such as the position and the residual energy of all sensor nodes; secondly, according to afictitious force model, figuring out the virtual gravity and the boundary repulsive force generated by all the nodes and applied to an aggregation node; finally, driving the aggregation node to moveto a new position under the action of a resultant force and along the direction of the resultant force so as to realize the data collection and treatment. According to the invention, the residual energy of a sensing node, the distance between the sensing node and the aggregation node and the position of the sensing node in a network topology are comprehensively considered to construct a fictitiousforce model. The aggregation node is enabled to move towards a region with a high residual energy in nature, so that the energy consumption between nodes is balanced. The formation of an energy cavity is effectively avoided, and a novel method is provided for prolonging the life cycle of the wireless sensor network.

The invention discloses a wireless sensor network data transmission method. The wireless sensor network data transmission method comprises the steps: S1 obtaining a sleep/wake plan of neighbor nodes; S2 obtaining link quality of the nodes; S3 selecting father nodes according to the link quality and the sleep/wake plan, selecting the nodes from the neighbor nodes according to the father nodes to form a candidate node set, dynamically selecting multiple nodes in the candidate mode set according to a greedy algorithm and using the nodes as next transmission nodes, and performing optimization to sending windows of the candidate nodes; and S4 utilizing the sleep/wake plan to a data pack to the father nodes when the father nodes wake. By means of the method, the transmission energy consumption of the sensor nodes is reduced, the service life of a wireless sensor network is prolonged, the rate, the success rate and the robustness of data transmission are improved, and data transmission delay is reduced.

The invention discloses a radio fiber connection interface communication library based on a FPGA and a realization method thereof. The radio fiber connection interface communication library makes the FPGA connect with a universal software-defined radio peripheral through an optical fiber interface. The radio fiber connection interface communication library comprises an external interface and an internal module. Through the external interface, the radio fiber connection interface communication library is connected with a wireless local area network reconfigurable physical layer and the radio peripheral. The internal module comprises a peripheral management module, a packager, a fiber interface module, an unpacking device, and a data transmission module. Through using a high-speed low-delay data transmission method, a dynamic radio frequency parameter configuring method, a flow control method based on speed, and a clock domain conversion method based on FIFO and other methods, the radio fiber connection interface communication library and the method solve connection problems of a software-defined radio development platform based on the FPGA and the radio peripheral, and communication library and the method are characterized by high speed, low delay, easy configuration, and support multi-sampling rate and user defined clock domain.

The invention discloses an adaptive routing method of a two-dimensional on-chip network based on a particle swarm algorithm. A path from a source node to a destination node in a network is coded as aparticle; all possible path codes are used as a particle searching space; each particle has two attributes including the position and the speed; when routing begins, the source node performs data transmission to the destination node according to deterministic routing; N effective paths are selected as initial population particles; when particle swarm algorithm iteration is carried out, the fitnessvalue of each particle is determined by the delay of the path node included in the particle and the data throughput of the node; the value having the best fitness is found out from a current particlepopulation; simultaneously, the historically best fitness value of each particle is recorded; the position and speed variables of each particle are updated; and, after iteration is completed, the position of the particle having the historically best fitness value is the optimal routing path. By means of the method, the transmission path of a data packet in a network can be dynamically adjusted; and the whole network load is balanced while the network delay is reduced.

The invention discloses a cloud cluster virtual routing system and a realization method thereof. The cloud cluster virtual routing system comprises a cloud cluster virtual routing service subsystem. The cloud cluster virtual routing service subsystem comprises a network management unit, cloud server pools, and forwarding servers, wherein the network management unit is in charge of management of the overall cloud cluster virtual routing system, resource scheduling, session management, terminal management and forwarding network construction management; each cloud server pool is a collection of server resources managed by the network management unit in the cloud cluster virtual routing system; and each forwarding server is used for constructing a routing forwarding network and in charge of virtual routing table construction, terminal registration and data forwarding, and the forwarding server is a server resource selected and deployed independently from the cloud server pool by the network management unit for each network session. According to the cloud cluster virtual routing system and the realization method thereof, internet data transmission congestion can be avoided to the maximal degree, and data transmission delay can be avoided.

A method for controlling data retransmission at a transmitting side in a wireless communication system is provided. In the method, the transmitting side transmits a new transmission packet to a receiving side. The transmitting side then transmits reason indication information, indicating a reason why the transmitting side has initiated the transmission of the new transmission packet, to the receiving side.